Serial is up line protocol is down

[akonwar]

Hello,
I have got a cisco 2611 router with the with serial interface connected to a serial communication system for commu. with another router .
However on giving the command sh int s0/1 at my end the following output comes and no data transfer takes place.
Serial0/1 is up, line protocol is down
Hardware is PowerQUICC Serial
Description: 'WAN link to HBCPL Bolpur'
Internet address is 10.76.1.121/30
MTU 1500 bytes, BW 64 Kbit, DLY 60000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
LCP Listen
Closed: BRIDGECP, IPCP, CCP, CDPCP, LLC2, BACP
Last input never, output never, output hang never
Last clearing of "show interface" counters 00:19:32
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 48 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
48 packets output, 672 bytes, 0 underruns
0 output errors, 0 collisions, 24 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
but all dcd, dsr dtr trs and cts are up what can be the problem and how to make the routers communicate.
the serial interface part in my end is like this
interface serial1/0
bandwidth 64
ip address 10.76.1.121 255.255.255.252
encapsulation ppp
delay 6000
keepalive 60
clock rate 64000

akonwar

 

[SmokeyBandid]

Maybe a problem with the clockrate ? Is it the correct clockrate and is it on the correct interface ? Dce or Dte ?

 

[rburke]

Also are you sure the line is PPP? From your "show ip int s1/0" output above it says:
" LCP Listen
Closed: BRIDGECP, IPCP, CCP, CDPCP, LLC2, BACP"

So it looks like LCP isn't getting connected. Which could be an encapsulation problem. But like SmokeyBandid said it can also be a clocking problem. Have you contacted the ISP about this?

 

[billberge]

Are you using any sort of authentication such as chap on the ppp connection? Also try running the debug ppp command and see if there might be a encapsulation mismatch.

 

[lushone]

is the clockrate bandwith and encap types the same on both sides?

 

[damesac]

I guess the question that needs to be asked is whether or not this link has ever been operational or is this a brand new setup? Do you not have access to the config of the router on the other end? If it has been up in the past, then what has changed?

"Be the packet."

 

[techkiwi]

I'm in New Zealand, so my experiences may be different to yours.

It's pretty unusual (in my neck of the woods) to have to set the clockrate if you're leasing a comms line from a telco. The DCE (ie the CSU/DSU/NTU) will nearly always provide the clocking.

Having said that, I wouldn't expect it to cause line protocol to go down, just the occasional bursts of errors. I would go with the suggestions to check the encapsulation.

 

[akonwar]

Thanks allfor your great response.
This setup is never operational yet. sorta experimental. how to i know whether my router is dce mode or dte mode?? also how to know which encapsulation is the best for my system.
actually the physical system is like this
myrouter-ss-v.35---nokia mux --dedicated channel--ofc ----nokia mux---ofc--v.35---ss-remoterouter. I don't have the remote end config with me. i am trying to arrange that. I am checking out your tips then ll get back soon.
akonwar

 

[commsguy]

Please post the other router config.


commsguy

http://www.convetech.com

 

[akonwar]

Other end Remote router config is as follows:
interface FastEthernet0/0
ip address 10.78.32.1 255.255.255.0
no ip mroute-cache
speed auto
full-duplex
!
interface Serial1/0
bandwidth 64
no ip address
encapsulation ppp
keepalive 60
-----------------------
sh int s0/0 is
Serial1/0 is up, line protocol is down
Hardware is PowerQUICC Serial
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
LCP Listen
Closed: BRIDGECP, IPCP, CCP, CDPCP, LLC2, BACP, IPV6CP
Last input never, output 00:00:04, output hang never
Last clearing of "show interface" counters 3d19h
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 48 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
396 input errors, 0 CRC, 18 frame, 0 overrun, 0 ignored, 378 abort
63027 packets output, 882378 bytes, 0 underruns
0 output errors, 0 collisions, 17442 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

 

[Cluebird]

Add an IP address to the serial1/0: ip add 10.76.1.122 255.255.255.252
Then do a no shut on both sides.